In the disposable diaper (1) of the present invention, an elastic region (ST) is formed by an elastic member (71) on the abdominal waist flap (FA) and the back waist flap (FB), and the elastic region (ST) absorbs sweat. A sheet part (4) is arranged. The sweat-absorbing sheet portion (4) is disposed closer to the wearer's skin than the elastic member (71). The length of the sweat absorbent sheet portion (4) on the back side region (B) side in the (X) direction is longer than the length of the sweat absorbent sheet portion (4) on the ventral region (A) side in the (X) direction. . In the stretchable region (ST) in which the sweat absorbing sheet portion (4) on the back side region (B) side is arranged, the contraction stress in the (Y) direction is such that the sweat absorbing sheet portion (4) on the ventral region (A) side. It is larger than the contraction stress in the (Y) direction of the arranged stretchable region (ST).本発明の使い捨ておむつ(1)は、腹側ウエストフラップ(FA)及び背側ウエストフラップ(FB)に、弾性部材(71)による伸縮領域(ST)が形成され、該伸縮領域(ST)に吸汗シート部(4)が配されている。吸汗シート部(4)は、弾性部材(71)よりも着用者の肌に近い側に配されている。背側領域(B)側の吸汗シート部(4)は、その(X)方向の長さが、腹側領域(A)側の吸汗シート部(4)の(X)方向の長さよりも長い。背側領域(B)側の吸汗シート部(4)が配された伸縮領域(ST)は、その(Y)方向の収縮応力が、腹側領域(A)側の吸汗シート部(4)が配された伸縮領域(ST)の(Y)方向の収縮応力よりも大きい。